landslides

Ground movements that vary in speed, depending on the slope’s gradient, the nature of the soil and what triggers it.

mudflow

Sudden flow of mud along a slope; it occurs when torrential rains quickly saturate the soil.

creep

Very slow, imperceptible movement of earth along a slope, caused mainly by alternating wet and dry periods.

earthflow

The upper section of a sloping water-soaked terrain that collapses, forming a tongue of land the length of the slope.

rockslide

Rock mass that suddenly detaches and falls from the top of a steep slope; it is caused by freeze-thaw action or by gravity.